DNS on Network

Hi, I'm running freebsd on a small network that is not connected to the outside world. I want to learn about dns and how to use it but it's a computer on the network. Is there anyway to do this with hostnames or with bogus domains? Thanks!

Do you know of any tutorials that might be able to help me out with this? I'm not really sure where to start. I've seen tutorials covering dns but would I just make up domain names and stick them in the hosts file pointing to my freebsd machine? Thanks.